uuid

uuid.go

package main

import (
	"crypto/rand"
	"fmt"
	"io"
)

func uuid() (string, error) {
	b := make([]byte, 16)
	if _, err := io.ReadFull(rand.Reader, b); err != nil {
		return "", err
	}
	b[8] = (b[8] | 0x80) & 0xBF
	b[6] = (b[6] | 0x40) & 0x4F
	return fmt.Sprintf("%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:]), nil
}

func main() {
	id, err := uuid()
	if err == nil {
		fmt.Println("My uuid:", id)
	}
}